Highest Ozone
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| County | Site | Units | 8-Hour | Hour of Day | 1-Hour | Hour of Day |
|---|---|---|---|---|---|---|
| Outagamie | Appleton | ppb | 54.5 | 06 PM | 57.4 | 01 PM |
| Ashland | Bad River Tribal School | ppb | 34.9 | 05 PM | 42.5 | 01 PM |
| Milwaukee | Bayside | ppb | 47.1 | 05 PM | 57.5 | 12 PM |
| Rock | Beloit-Converse | ppb | 47.3 | 12 PM | 48.7 | 12 PM |
| Kenosha | Chiwaukee Prairie | ppb | 47.1 | 04 PM | 59.3 | 02 PM |
| Columbia | Columbus | ppb | 57.3 | 05 PM | 60.9 | 03 PM |
| Sauk | Devils Lake | ppb | 48.4 | 05 PM | 55.1 | 03 PM |
| Eau Claire | Eau Claire DOT Sign Shop | ppb | 54.6 | 04 PM | 58.4 | 01 PM |
| Walworth | Elkhorn | ppb | 47.8 | 03 PM | 51.4 | 12 PM |
| Fond du Lac | Fond Du Lac | ppb | 55.3 | 05 PM | 59.8 | 02 PM |
| Ozaukee | Grafton | ppb | 52.4 | 05 PM | 63.7 | 01 PM |
| Brown | Green Bay UW | ppb | 58.9 | 06 PM | 68.5 | 02 PM |
| Ozaukee | Harrington Beach Park | ppb | 55.4 | 06 PM | 66.1 | 01 PM |
| Dodge | Horicon Wildlife Area | ppb | 58.7 | 05 PM | 62.6 | 12 PM |
| Jefferson | Jefferson-Laatsch | ppb | 54.9 | 04 PM | 58.6 | 03 PM |
| Kenosha | Kenosha-Water Tower | ppb | 48.2 | 11 PM | 51.8 | 09 PM |
| Kewaunee | Kewaunee | ppb | 58.1 | 06 PM | 66 | 04 PM |
| La Crosse | La Crosse DOT | ppb | 40.8 | 08 PM | 44.6 | 02 PM |
| Marathon | Lake Dubay | ppb | 48.3 | 07 PM | 55.2 | 02 PM |
| Dane | Madison East | ppb | 52.1 | 05 PM | 55.3 | 02 PM |
| Manitowoc | Manitowoc | ppb | 55.7 | 05 PM | 64.9 | 03 PM |
| Milwaukee | Milwaukee-16th St. Health Center | ppb | 47 | 05 PM | 53.4 | 12 PM |
| Milwaukee | Milwaukee-UWM UPark | ppb | 45.6 | 04 PM | 54.9 | 12 PM |
| Door | Newport Park | ppb | 60.1 | 09 PM | 62.6 | 06 PM |
| Forest | Potawatomi | ppb | 43.1 | 09 PM | 46.3 | 04 PM |
| Racine | Racine-Payne & Dolan | ppb | 45.7 | 09 PM | 51.4 | 07 PM |
| Sheboygan | Sheboygan-Haven | ppb | 53.3 | 05 PM | 62.7 | 03 PM |
| Sheboygan | Sheboygan-Kohler Andrae | ppb | 57 | 06 PM | 66 | 01 PM |
| Vilas | Trout Lake | ppb | 42.9 | 06 PM | 51.6 | 03 PM |
| Waukesha | Waukesha-Cleveland Ave. | ppb | 52.8 | 04 PM | 57.7 | 12 PM |